An ideal inverting op-amp circuit is to be designed with a closed-loop voltage gain of (A_{v}=-1000). The

Question:

An ideal inverting op-amp circuit is to be designed with a closed-loop voltage gain of $A_{v}=-1000$. The largest resistor value to be used is $500 \mathrm{k} \Omega$.

(a) If the simple two-resistor design shown in Figure 9.8 is used, what is the input resistance?

(b) If the T-network design shown in Figure 9.12 with $R_{3}=500 \mathrm{k} \Omega$ and $R_{2}=R_{4}=250 \mathrm{k} \Omega$ is used, what is the input resistance?

Figure 9.8:-